<template>
  <div class="cart">
    <h4>全部商品</h4>
    <div class="cart-main">
      <div class="cart-th">
        <div class="cart-th1">全部</div>
        <div class="cart-th2">商品</div>
        <div class="cart-th3">单价（元）</div>
        <div class="cart-th4">数量</div>
        <div class="cart-th5">小计（元）</div>
        <div class="cart-th6">操作</div>
      </div>
      <div class="cart-body">
        <ul class="cart-list" v-for="(cartInfo,index) in cartInfoList" :key="cartInfo.id">
          <li class="cart-list-con1">
            <input
              type="checkbox"
              name="chk_list"
              :checked="cartInfo.isChecked==1"
              @change="changeChecked(cartInfo,$event)"
            />
          </li>

          <li class="cart-list-con2">
            <img :src="cartInfo.imgUrl" />
            <div class="item-msg">{{cartInfo.skuName}}</div>
          </li>

          <li class="cart-list-con4">
            <span class="price">{{cartInfo.skuPrice}}</span>
          </li>

          <li class="cart-list-con5">
            <a href="javascript:void(0)" class="mins" @click="handler('minus',-1,cartInfo)">-</a>
            <input
              autocomplete="off"
              type="text"
              :value="cartInfo.skuNum"
              minnum="1"
              class="itxt"
              @change="handler('change',$event.target.value*1,cartInfo)"
            />
            <a href="javascript:void(0)" class="plus" @click="handler('add',+1,cartInfo)">+</a>
          </li>

          <li class="cart-list-con6">
            <span class="sum">{{cartInfo.skuPrice * cartInfo.skuNum}}</span>
          </li>

          <li class="cart-list-con7">
            <a href="javascript:void(0)" class="sindelet" @click="deleteCart(cartInfo.skuId)">删除</a>
            <br />
            <a href="#none">移到收藏</a>
          </li>
        </ul>
      </div>
    </div>
    <div class="cart-tool">
      <div class="select-all">
        <input
          class="chooseAll"
          type="checkbox"
          :checked="isAllCheck && cartInfoList.length>0"
          @change="updateAllCartChecked"
        />
        <span>全选</span>
      </div>
      <div class="option">
        <a href="javascript:;" @click="deleteAllChecked">删除选中的商品</a>
        <a href="#none">移到我的关注</a>
        <a href="#none">清除下柜商品</a>
      </div>
      <div class="money-box">
        <div class="chosed">
          已选择
          <span>{{cartInfoList.length}}</span>件商品
        </div>
        <div class="sumprice">
          <em>总价（不含运费） ：</em>
          <i class="summoney">{{totalPrice}}</i>
        </div>
        <div class="sumbtn">
          <router-link class="sum-btn" to="/trade">结算</router-link>
        </div>
      </div>
    </div>
  </div>
</template>

<script>
// vuex辅助函数
import { mapGetters } from 'vuex'
// 引入判断数字的正则表达式
import { skuNumChange } from '@/utils/myReg'
// 引入防抖函数
import { throttle } from '@/utils/tools'
// 引入节流函数
// import throttle from 'lodash/throttle'
export default {
  name: 'ShopCart',
  data () {
    return {

    }
  },
  methods: {
    // 获取购物车的数据
    getData () {
      this.$store.dispatch('getCartList')
    },

    // 更改购买产品数量
    // type判断点击的是哪一个按钮，deltaNum是产品数量，cartInfo用来获取产品的skuId
    handler: throttle(async function (type, deltaNum, cartInfo) {
      // switch表达式判断应该触发那种类型的函数
      let skuId = cartInfo.skuId;
      let skuNum;
      switch (type) {
        case 'add':
          skuNum = deltaNum;
          break;
        case 'minus':
          // 产品的个数 > 1 才能相减
          if (cartInfo.skuNum > 1) {
            skuNum = deltaNum;
          } else {
            skuNum = 0;
          }
          break;
        case 'change':
          deltaNum = skuNumChange(deltaNum);
          skuNum = deltaNum - cartInfo.skuNum;
          break;
      };

      try {
        await this.$store.dispatch('addOrUpdateShopCart', { skuId, skuNum });

        // 刷新购物车数据
        this.getData();
      } catch (error) {
        alert(error.message);
      }
    }, 500),

    // 删除购物车的数据
    async deleteCart (skuId) {
      try {
        // 删除成功
        let result = await this.$store.dispatch('deleteCart', skuId);
        // console.log(result);
        // 刷新数据
        this.getData();
      } catch (error) {
        alert(error.message);
      }
    },

    // 改变商品的选中状态
    async changeChecked (cartInfo, event) {
      try {
        // 将isChecked的布尔值转换成1|0
        let checked = event.target.checked ? "1" : "0"
        // 派发actions
        await this.$store.dispatch('updateChecked', { skuId: cartInfo.skuId, isChecked: checked });
        // 获取更新后商品列表状态
        this.getData()
      } catch (error) {
        alert(error.message);
      }
    },

    // 删除所有选中的商品
    async deleteAllChecked () {
      try {
        await this.$store.dispatch('deleteAllCheckedCart');
        // 再次获取购物车列表
        this.getData();
      } catch (error) {
        alert(error.message);
      }
    },

    // 商品全选
    async updateAllCartChecked (event) {
      // 判断对象是否为空对象，商品对象为空则不发送任何请求
      let arr = Object.keys(this.cartList)
      if (arr != 0) {
        try {
          let isChecked = event.target.checked ? '1' : '0';
          // 派发action
          await this.$store.dispatch('updateAllCartIsChecked', isChecked);
          // console.log(checked);
          // 更新购物车列表
          // this.getData()
        } catch (error) {

          alert(error.message);
        }
      }
    }
  },
  computed: {
    // 映射vuex中carlist数据
    ...mapGetters(['cartList']),
    // 购物车数据
    cartInfoList () {
      return this.cartList.cartInfoList || [];
    },
    // 购买产品总价
    totalPrice () {
      let selectPrice = this.cartInfoList.filter(item => { return item.isChecked == 1 }).reduce((prev, item) => { return prev += item.skuNum * item.skuPrice }, 0);
      return selectPrice;
    },
    // 判断全选框是否勾选
    isAllCheck () {
      return this.cartInfoList.every(item => item.isChecked == 1)
    }
  },
  mounted () {
    let res = this.getData()
    // console.log(res);
  },
}
</script>

<style lang="less" scoped>
.cart {
  width: 1200px;
  margin: 0 auto;

  h4 {
    margin: 9px 0;
    font-size: 14px;
    line-height: 21px;
  }

  .cart-main {
    .cart-th {
      background: #f5f5f5;
      border: 1px solid #ddd;
      padding: 10px;
      overflow: hidden;

      & > div {
        float: left;
      }

      .cart-th1 {
        width: 25%;

        input {
          vertical-align: middle;
        }

        span {
          vertical-align: middle;
        }
      }

      .cart-th2 {
        width: 25%;
      }

      .cart-th3,
      .cart-th4,
      .cart-th5,
      .cart-th6 {
        width: 12.5%;
      }
    }

    .cart-body {
      margin: 15px 0;
      border: 1px solid #ddd;

      .cart-list {
        padding: 10px;
        border-bottom: 1px solid #ddd;
        overflow: hidden;

        & > li {
          float: left;
        }

        .cart-list-con1 {
          width: 15%;
        }

        .cart-list-con2 {
          width: 35%;

          img {
            width: 82px;
            height: 82px;
            float: left;
          }

          .item-msg {
            float: left;
            width: 150px;
            margin: 0 10px;
            line-height: 18px;
          }
        }

        .cart-list-con4 {
          width: 10%;
        }

        .cart-list-con5 {
          width: 17%;

          .mins {
            border: 1px solid #ddd;
            border-right: 0;
            float: left;
            color: #666;
            width: 6px;
            text-align: center;
            padding: 8px;
          }

          input {
            border: 1px solid #ddd;
            width: 40px;
            height: 33px;
            float: left;
            text-align: center;
            font-size: 14px;
          }

          .plus {
            border: 1px solid #ddd;
            border-left: 0;
            float: left;
            color: #666;
            width: 6px;
            text-align: center;
            padding: 8px;
          }
        }

        .cart-list-con6 {
          width: 10%;

          .sum {
            font-size: 16px;
          }
        }

        .cart-list-con7 {
          width: 13%;

          a {
            color: #666;
          }
        }
      }
    }
  }

  .cart-tool {
    overflow: hidden;
    border: 1px solid #ddd;

    .select-all {
      padding: 10px;
      overflow: hidden;
      float: left;

      span {
        vertical-align: middle;
      }

      input {
        vertical-align: middle;
      }
    }

    .option {
      padding: 10px;
      overflow: hidden;
      float: left;

      a {
        float: left;
        padding: 0 10px;
        color: #666;
      }
    }

    .money-box {
      float: right;

      .chosed {
        line-height: 26px;
        float: left;
        padding: 0 10px;
      }

      .sumprice {
        width: 200px;
        line-height: 22px;
        float: left;
        padding: 0 10px;

        .summoney {
          color: #c81623;
          font-size: 16px;
        }
      }

      .sumbtn {
        float: right;

        a {
          display: block;
          position: relative;
          width: 96px;
          height: 52px;
          line-height: 52px;
          color: #fff;
          text-align: center;
          font-size: 18px;
          font-family: 'Microsoft YaHei';
          background: #e1251b;
          overflow: hidden;
        }
      }
    }
  }
}
</style>
